Question

Carboxylic acids do not give the characteristic reaction of $>C=O$ group because of:

• A. polar nature
• B. resonance
• C. symmetrical structure
• D. attached alkyl group

Answer 1

The correct option is B resonance

The carbonyl group of ketones & aldehydes is more electrophilic than in carboxylic acids. This is because the lone pairs on Oxygen atom attached to Hydrogen atom in the $-C{O}_{2}H$ are involved in resonance thereby making the carbon atom less electrophilic.

Figure-1 represents Resonance in $-C{O}_{2}H$

Figure-2 represents Carbonyl carbon.